Installed JDK but still error message when running java class

Hello
Can you please help me somebody?
I installed everything how it was in the book.
So I created my first script.
I ran "javac HelloUser.java" which created the class.
And then when I want to run the "java HelloUser " I always get this message:
exeption in thread "main" java.lang.NoClassDefFoundError: HelloUser
I just dont understand it. I changed the paths in the system settings as well.
Thank you
Thomas Popovits

http://onesearch.sun.com/search/onesearch/index.jsp?qt=java.lang.NoClassDefFoundError&subCat=siteforumid%3Ajava54&site=dev&dftab=siteforumid%3Ajava54&chooseCat=javaall&col=developer-forums

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